Asphalt cutter operating under the weight of the machine



June 16, 1959 c HALL 2,890,872

ASPHALT CUTTER OPERATING UNDER THE WEIGHT OF THE MACHINE Filed Nov. 19, 1956 I I FIG. 2 L 29 a. 25 fi 92 a h 36 o L 1 I? .h v

\J u 2| s ATTOR/VZ United States Patent ASPHALT CUTTER OPERATING UNDER THE WEIGHT OF THE MACHINE Charles Cecil Hall, San Diego, Calif.

Application November 19, 1956, Serial No. 622,933

1 Claim. (Cl. 262-20) The present invention relates to asphalt and concrete cutters and more particularly to a cutter which mounts on a rolling machine or other heavy equipment without interference with the normal use thereof.

In carrying out my invention, I utilize the weight of the rolling machine in applying weight to the cutter in its operation. More specifically I pivotally mount a cutter wheel on the side of the rolling machine so that the wheel may be moved below the road contacting surface of the roller for cutting operation under the weight of the machine and be moved above the road contacting surface of the machine in non-use position to permit normal rolling operation of the machine. The movement of the cutter wheel to either of its two positions is by a hydraulic jack connected to the hydraulic pump in the hydraulic system of the machine.

Further objects and advantages will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of the invention is illustrated.

In the drawings:

Fig. 1 is a plan view showing the cutter wheel, mounting attachment and hydraulic actuator ready for mounting;

Fig. 2 is a side view of the cutter attached to a rolling machine and in operating position; and

Fig. 3 is a cross-sectional view taken along the line 3-3 in Fig. 2 to better show the pivotal mounting of the cutter attachment.

Referring more in detail to the drawings, there is shown in plan view in Fig. 1 an L-shaped mounting plate having a base member 11 and an upstanding wall 12. Pivotally mounted to one end of wall 12 is a double acting hydraulic jack 13 having flexible lines 14, 16 for connection to the hydraulic system of the machine. Fluid is pumped under pressure through a selected one of lines 14, 16 to move piston 17 in or out of the jack cylinder 18. Also pivotally mounted to wall 12 of plate 10 is a lever 19 which carries the cutting wheel 21.

In Fig. 2 there is shown a partial side View of a road construction machine 22, such as an asphalt rolling machine for example. Mounting plate 10 is fastened to the machine with base 11 extending under the lower edge of machine cover 23 so as to distribute the weight of the machine along the length of the base 11 when the cutter is in cutting position. This distribution of weight is to prevent buckling of cover 23 as would be more apt to occur if the lever 19 were pivotally mounted to the cover 23 and all the Weight was concentrated at the pivotal mounting. Wall 12 of plate 10, in addition to having pivotal lever and hydraulic jack connections thereto, lends rigidity and ing base 11. a

Lever 19 is pivotally mounted at a 'point intermediate its ends to wall 12 and its upper end26 is pivotally connected to hydraulic piston 17 for actuation. thereby. The cutter wheel 21 is rotatably mounted at the lower end 27 of the lever. Normally about 400 pounds hydraulic pressure is sufiicient to move and hold the cutter wheel in its down operating position. However, in the event the machine does not have this much pressure available, an increase in length of the upper arm of lever 19 over the length of its lower arm will maintain the required force about the lever pivot with less hydraulic pressure. A stifiening member 28 is attached to lever 19 at its pivotal connection with wall 12 of plate 10 and adapted to pivot therewith. This stiffening member rotates in contact with the wall and prevents wall buckling and deformation of the pivot point. It should be noted that in operating position the lever is vertical so that it, and not the hydraulic system, is transmitting the weight of the machine to the cutter wheel. The piston is in its outermost extended position so that forward movement of the machine plus the structure of the hydraulic jack, not the hydraulic pressure, maintains the lever in its vertical position.

Fig. 3 is a cross-sectional view showing the pivotal connection of the piston 17 and the upper end 26 of lever 19, the rotational connection of cutter wheel 21 with the lower end 27, and the pivotal connection of the lever 19 with wall 12 of mounting plate 10. As shown, the piston 17 is connected to end 26 by means of a pin 29 inserted through aligned openings therein. Cutter wheel 21 has a tapered hardened cutting surface and is mounted on ball bearings 31 at the lower end 27 of the lever. A mounting shaft 32 is attached to wall 12 and the lever 19 mounted thereon by means of needle bearings 33 of the tapered roller type. Bearing cover 34 is mounted thereover and has an appropriate grease fitting 36 therein for convenience in lubricating the bearings.

It is desired to point out special advantages of the preferred embodiment. The cutter is adapted for mounting on heavy road equipment without extensive modifications. The mounting plate and stiffening member distributes the weight over a wide area and prevents buckling. It does not interfere with the normal operation of the machine. All parts are easily and quickly installed, replaced and/ or repaired. The hydraulic system of the machine is used to operate the positioning lever. The control valve and handle (not shown) may be mounted at any convenient position and the operator can operate the machine and adjust the cutter for depth without leaving his seat.

While the embodiment herein shown and described constitutes a preferred form, it is to be understood that other forms may be adopted without departing from the scope of the appended claim.

I claim:

An asphalt cutter for a road working machine comprising a mounting plate, said mounting plate having means for securing same to a road working machine, a first pivot centrally positioned on said mounting plate, a lever centrally mounted on said first pivot for pivotal movement thereon, a cutter wheel rotatably mounted on the lower end of said lever, a second pivot secured to said mounting plate adjacent one end thereof, hydraulic piston and cylinin pivotal relationship therewithand" atthe free end' ofthe piston to the upper end of said lever in pivotal relationship therewith, said lever being movable by said hydraulic cylinder and piston means to a vertical position when the piston is in a fully extended position thereby placing the cutter wheel in operational position in which the axis of the wheel is vertically aligned with the axis of the first pivot, whereby the weight from the road machine is transmitted to said wheel unassisted by said hydraulic piston means and the forward movement of said machine exerts no backward pressure against the hydraulic cylinder and piston means, said lever being movable by hydraulic,

cylinder and piston means to a position in which the cutter wheel is inoperable, and fluid means, for operating 15 2,783,017

said hydraulic cylinder and piston means for movement ofsaid lever to selectedpositions;

References Cited in the file of this patent UNITED STATES PATENTS 615,698 Hardy Dec. 13, 1898 1,331,367 Petermann Feb. 17, 1920 1,344,560 Petermann June 22, 1920 2,284,388 Gurn'es May 26, 1942 2,336,487 Lewis et a1. Dec. 14, 1943 2,700,256 Lewis Jan. 25, 1955 2,730,401 Rea Jan. 10, 1956 2,732,196 Wood Jan. 24, 1956 Lewis Feb. 19, 1957 

